The main thread is the primary thread of execution in a program. It is responsible for executing the main sequence of instructions and coordinating other threads or tasks in the program. In many programming environments, including web browsers and operating systems, the main thread is where the program starts and where most of the program’s logic is executed.
In multi-threaded programming, the main thread is often used to handle user interface interactions, perform I/O operations, and coordinate the execution of other threads. It is important for the main thread to be responsive and not blocked by long-running tasks, as this can make the program appear sluggish or unresponsive.